This number was 31.8 percent lower than the state average of 42 percent. In 2018 the total municipality population reached 313.
78 percent of the population had at least a high school diploma or the equivalent. The table below shows how many Joppa residents who were at least 25 years old in 2018 held each of the listed degrees.
Degree distribution in Joppa for 2018*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 45 | 22 |
| Regular high school diploma | 71 | 34.6 |
| GED or alternative credential | 21 | 10.2 |
| Some college, less than 1 year | 17 | 8.3 |
| Some college, 1 or more years, no degree | 30 | 14.6 |
| Associate's degree | 10 | 4.9 |
| Bachelor's degree | 7 | 3.4 |
| Master's degree | 2 | 1 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 2 | 1 |
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